On 10/23/06, Sebastian Weber <sebastian.weber@physik.tu-darmstadt.de> wrote:
Hello there!
I'm about to explore the power of boost::bind, but I am still a beginner. Maybe the question is rather stupid, but the following code does not compile and I do not understand why:
typedef std::vector<std::size_t> data_t;
data_t dataVec;
... populate dataVec ...
std::size_t shiftIndex = 3;
boost::function<std::size_t& (std::size_t)> shiftedData = boost::bind(&data_t::at, &dataVec, _1 - shiftIndex);
The error message is something like
/home/sweber/graphpkg/libs/boost/boost/function/function_template.hpp:119: error: invalid initialization of reference of type 'size_t&' from expression of type 'const unsigned int'
My system is a debian sarge with a g++-3.3 and boost 1.33.1.
What I'm trying to do is to shift the index of the data-vector such that index 3 would address the first element.
Thanks for any help.
Greetings,
Sebastian Weber
Boos.Bind will only do the binding bit - what you're wanting to do (apply an expression to the parameter at call-time) can be accomplished with Boost.Lambda - which has its own bind facility (with pretty much exactly the same syntax as Boost.Bind) that you'll need to use instead of Boost.Bind. HTH Stuart Dootson